Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cefd440e17bfb63…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 03:49:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3c31256a5aa5239837ebc1c043d34257 SHA-1: ab095dfb214c09201f2fe3db9a8112973c296132 SHA-256: 6cefd440e17bfb637ed75d4872546c0bdd7289b10486b85b111c6c6fd33f53bc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-free-link-app-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-joystick-android_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-center_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-money-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-unlimited-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/infinite-jump-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-robux-for-free-for-robloxcom-free4mobile24com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3197 22704 bytes
SHA-256: 807fa8a2916d1cf21e6ab0e6a84edf3d269e8186e319c5a60a06aad3d61efa03
font_01_sfnt_off00006464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6464 18344 bytes
SHA-256: 31551953d011482b0d46d086addc86e7e083de2f1ea25a6008bace3091db76b0

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